Region in shade there allows light (8)
I believe the answer is:
ethereal
'light' is the definition.
(thesaurus)
'region in shade there allows' is the wordplay.
'region in' indicates a hidden word.
'ETHEREAL' can be found hidden inside 'shade there allows'.
(Other definitions for ethereal that I've seen before include "Heavenly - fairy-like" , "Extremely delicate and light; otherworldly" , "Very delicate - tale here (anag)" , "Delicate and perfect" , "Like fairies" .)